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Injection Molding Adapter Nozzle

IP.com Disclosure Number: IPCOM000082098D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Friery, EJ: AUTHOR

Abstract

An adapter placed between a plastic injection molding machine's nozzle and a mold's sprue, increases the largest size part that can be made by the machine.

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Injection Molding Adapter Nozzle

An adapter placed between a plastic injection molding machine's nozzle and a mold's sprue, increases the largest size part that can be made by the machine.

For any nozzle-mold combination, the part size is limited by the distance between the nozzle entrance and the mold's farthest extremity. Normally, a significant portion of this distance is used by an entrance sprue which is later removed from the molded part. The sprue cannot be shortened by merely lengthening the nozzle, because heated liquid plastic will cool in the lengthened nozzle and may solidify too early.

The adapter contains electric cartridge heaters which maintain a proper plastic temperature and a shut-off pin, which cuts off plastic flow at the nozzle entrance to separate the sprue from the nozzle. The pin also keeps plastic, held liquid by the heater, inside the adapter between molding operations.

Large, relatively flat parts, which may be made because of this adapter, usually require one smooth surface for good appearance. This is achieved by driving the ejector pins with a plate placed on the same side of the part as the nozzle.

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